Disable canvas line dashing when dash sequence is all zeros.

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #include "modules/canvas2d/CanvasRenderingContext2DState.h"
 
 #include "core/css/CSSFontSelector.h"
 #include "core/css/resolver/FilterOperationResolver.h"
@@ skipping 181 matching lines @@
 {
     m_lineDash = dash;
     // Spec requires the concatenation of two copies the dash list when the
     // number of elements is odd
     if (dash.size() % 2)
         m_lineDash.appendVector(dash);
 
     m_lineDashDirty = true;
 }
 
+static bool hasANonZeroElement(const Vector<float>& lineDash)
+{
+    for (size_t i = 0; i < lineDash.size(); i++) {
+        if (lineDash[i] != 0.0f)
+            return true;
+    }
+    return false;
+}
+
 void CanvasRenderingContext2DState::updateLineDash() const
 {
     if (!m_lineDashDirty)
         return;
 
-    if (m_lineDash.size() == 0) {
+    if (!hasANonZeroElement(m_lineDash)) {
         m_strokePaint.setPathEffect(0);
     } else {
         RefPtr<SkPathEffect> dashPathEffect = adoptRef(SkDashPathEffect::Create(m_lineDash.data(), m_lineDash.size(), m_lineDashOffset));
         m_strokePaint.setPathEffect(dashPathEffect.get());
     }
 
     m_lineDashDirty = false;
 }
 
 void CanvasRenderingContext2DState::setStrokeStyle(CanvasStyle* style)
@@ skipping 306 matching lines @@
         paint->setLooper(0);
         paint->setImageFilter(shadowAndForegroundImageFilter());
         return paint;
     }
     paint->setLooper(shadowAndForegroundDrawLooper());
     paint->setImageFilter(0);
     return paint;
 }
 
 } // blink